Ladies help I haven't had my period since feb 19 2016 my daughter is almost nine months now I've…

Ladies help I haven't had my period since feb 19 2016 my daughter is almost nine months now I've stopped breast feeding when I talk to my doctor she tells me I have to wait it out it will come back on its own how can I get it back...I'm always nervous that I'm pregnant and will never know because of not getting my period